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Ross Bunn added These_discriminators_include_the_Most__.tex
over 8 years ago
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These discriminators include the Most Unstable Convective Available Potential Energy and the equivalent potential temperature (hereafter refereed to as MUCAPE and θe respectively). These quantities are simple to calculate from both Bureau of Meteorology soundings and EraInt soundings, both of which are readily available. Discriminators based on these quantities will be used to separate surface-based conditionally unstable environments from conditionally-unstable environments which occur only for parcels that originate above the surface. To test EraInt’s ability to capture these indices, a comparison to observed sounding indices at all Australian Capital City airports from 2008-2014 has been created. Figure 1 shows various indices calculated from EraInt soundings, compared to the same indices derived from observed soundings with matching EraInt vertical resolution. With good agreement between EraInt and observed θe values, the criterion surface θe being less than Upper θe could be a robust EraInt discriminator between surface and elevated storms. Whilst there is poor agreement between values of observed and EraInt CAPE/MUCAPE, CIN/MUCIN, and the pressure level where the maximum upper θe values occur, the sign of the difference between surface and upper indices could be a promising discriminator.
